165015001 has 4 divisors (see below), whose sum is σ = 165396532. Its totient is φ = 164633472.

The previous prime is 165014987. The next prime is 165015029. The reversal of 165015001 is 100510561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43243776 + 121771225 = 6576^2 + 11035^2 .

It is a cyclic number.

It is not a de Polignac number, because 165015001 - 2¹⁹ = 164490713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165015001.

It is not an unprimeable number, because it can be changed into a prime (165015031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190116 + ... + 190981.

It is an arithmetic number, because the mean of its divisors is an integer number (41349133).

Almost surely, 2^165015001 is an apocalyptic number.

It is an amenable number.

165015001 is a deficient number, since it is larger than the sum of its proper divisors (381531).

165015001 is an equidigital number, since it uses as much as digits as its factorization.

165015001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381530.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 165015001 is about 12845.8164785272. The cubic root of 165015001 is about 548.4972764735.

Adding to 165015001 its reverse (100510561), we get a palindrome (265525562).

The spelling of 165015001 in words is "one hundred sixty-five million, fifteen thousand, one".